Pagination on custom post type (404 not found)

Hi, I have a problem with custom post type. I used Custom Post Type UI plugin.
My code in archive.php:

<?php
			$type = 'products';
			if ( get_query_var('paged') ) {
				$paged = get_query_var('paged');
			} else if ( get_query_var('page') ) {
				$paged = get_query_var('page');
			} else {
				$paged = 1;
			}
			$args=array(
				'post_type' => $type,
				'cat' => $cat,
				'post_status' => 'publish',
				'paged' => $paged,
				'posts_per_page' => 3,
				'caller_get_posts'=> 3
			);
			$temp = $wp_query;  // assign original query to temp variable for later use
			$wp_query = null;
			$wp_query = new WP_Query();
			$wp_query->query($args);
		?>
		<?php while($wp_query->have_posts()) : $wp_query->the_post(); ?>

I’m using wp-pagenavi plugin for pagination.
<?php wp_pagenavi(); $wp_query = null; $wp_query = $temp; ?>

…and code from plugin:

register_post_type('products', array(	'label' => 'Produkty','description' => '','public' => true,'show_ui' => true,'show_in_menu' => true,'capability_type' => 'post','hierarchical' => false,'rewrite' => array('slug' => ''),'query_var' => true,'has_archive' => true,'exclude_from_search' => false,'supports' => array('title','editor','excerpt','trackbacks','custom-fields','comments','revisions','thumbnail','author','page-attributes',),'taxonomies' => array('category',),'labels' => array (
  'name' => 'Produkty',
  'singular_name' => 'Produkt',
  'menu_name' => 'Produkty',
  'add_new' => 'Add Produkt',
  'add_new_item' => 'Add New Produkt',
  'edit' => 'Edit',
  'edit_item' => 'Edit Produkt',
  'new_item' => 'New Produkt',
  'view' => 'View Produkt',
  'view_item' => 'View Produkt',
  'search_items' => 'Search Produkty',
  'not_found' => 'No Produkty Found',
  'not_found_in_trash' => 'No Produkty Found in Trash',
  'parent' => 'Parent Produkt',
),) );

link /category/produkty/page/2/ return 404 page
and ?cat=4&paged=2 too

Please help me.
Cheers.